# US 9,435,017 B2 · Manufacturing method of titanium alloy with high-strength and high-formability and its titanium alloy

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- Number: US 9,435,017 B2
- Document ID: US9435017B2
- Status: Granted
- Kind: B2
- Application number: 13/879,206
- Filed: 2012-03-19
- Published: 2014-10-16
- Granted: 2016-09-06
- Earliest claimed: 2012-01-11
- Assignees: Korea Institute of Machinery & Materials
- Applicants: Chan Hee Park; Chang Seok Oh; Jong Taek Yeom; Jae Keun Hong; Chong Soo Lee; Yong Taek Hyun
- Inventors: Chan Hee Park; Chang Seok Oh; Jong Taek Yeom; Jae Keun Hong; Chong Soo Lee; Yong Taek Hyun
- Web page: https://patentgrep.com/patent/US9435017B2

## CPC

- C22F 1/183: {of titanium or alloys based thereon}
- C22C 14/00: Alloys based on titanium
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A method of manufacturing a titanium alloy with high strength and high formability, the method including preparing a titanium alloy material and equipment for manufacturing the titanium alloy, manufacturing the titanium alloy having a lamellar structure (martensite structure) by cooling the prepared titanium alloy material with water after performing heat treatment at the beta transformation temperature or more, and rolling that makes ultrafine grains by finishing forming of the titanium alloy at a plastic instability temperature or less of an initial lamellar structure by gradually decreasing the forming temperature in accordance with an increase of a strain after starting the forming at the plastic instability temperature or more of an initial lamellar structure, under a condition of a low strain in which the strain is 2.5 or less, after the manufacturing of a titanium alloy having a lamellar structure.

## Claims

### Claim 1

A method of manufacturing a titanium alloy, the method comprising:
preparing a titanium alloy material and equipment for manufacturing a titanium alloy;
manufacturing the titanium alloy having a lamellar structure by cooling the prepared titanium alloy material with water after performing heat treatment at the beta transformation temperature or more; and
rolling that makes ultrafine grains by finishing forming of the titanium alloy at a plastic instability temperature by gradually decreasing the forming temperature in accordance with an increase of a strain after starting the forming at the plastic instability temperature or more, under a condition of a low strain in which the strain is 2.5 or less, after the manufacturing of a titanium alloy having a lamellar structure.

### Claim 2 (depends on 1)

The method of claim 1, wherein, in the rolling, the initial forming start temperature for starting the forming is the plastic instability temperature or more of an initial lamellar structure, the final forming temperature for finishing the forming is the plastic instability temperature or less of an initial lamellar structure, and the process is finished while maintaining the plastic instability temperature or less of the initial lamellar structure when the strain reaches 2.5 while decreasing the temperature along a predetermined drop curve in accordance with an increase in the strain after starting the forming at a forming temperature of the plastic instability temperature or more at the initial stage.